No its not been rolling roaded.
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I know becuase i work with the guy.
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It only has a cat back pro speed exhaust which wont do much.
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I removed the rocker cover and had a look, nothing seems out all as it should be and then rattled everything else with no result.
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I think it maybe the water pump as on closer inspection the sound does appear to be coming from it, but a bit hard to single it out exactly.
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The rattle rises with revs but not in time with the revs, so pretty much ruled out it being an engine fault.
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How much trouble would i be in if the water pump failed? Just overheat?